Polyamide composite reverse osmosis membrane and preparation method thereof
A technology of reverse osmosis membrane and polyamide membrane, which is applied in the field of polyamide composite reverse osmosis membrane and its preparation, can solve the problems of reducing anti-pollution, loss of anti-pollution, high temperature treatment, etc. Easy to control, strong anti-pollution effect
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Embodiment 1
[0041] Dissolve 120g sodium carboxymethylcellulose in 10kg water, adjust the pH to 3, add 10.5g sodium periodate, and stir for 2h. Under the condition of stirring, sodium thiosulfate and hydrochloric acid were alternately added dropwise until the solution no longer changed color to obtain a bisaldehyde carboxymethylcellulose solution.
[0042] The anti-pollution composite reverse osmosis membrane production comprises using the nascent polyamide composite reverse osmosis membrane of comparative example 1 as the membrane to be grafted, and the membrane surface of the grafted membrane to be grafted with carboxymethyl fiber containing a mass concentration of 0.5% The plain aqueous solution is contacted at room temperature (20° C.-30° C.) for 1 min, and washed repeatedly with deionized water to obtain a polyamide composite reverse osmosis membrane grafted with a hydrophilic polymer and anti-fouling.
[0043] The test method is the same as that of Comparative Example 1, and its perf...
Embodiment 2
[0046] Dissolve 140g of sodium hydroxypropyl cellulose in 10kg of water, adjust the pH to 3, add 14.5g of sodium periodate, and stir for 2 hours. Under the condition of stirring, sodium thiosulfate and hydrochloric acid were alternately added dropwise until the solution no longer changed color to obtain a bisaldehyde carboxymethylcellulose solution.
[0047] The production of anti-pollution composite reverse osmosis membrane includes using the nascent polyamide composite reverse osmosis membrane of comparative example 1 as the membrane to be grafted, and contacting the membrane surface with a dialdehyde carboxymethyl cellulose aqueous solution containing 1.2% mass concentration for 1.5min , after repeated washing with deionized water, a hydrophilic polymer-grafted, anti-fouling polyamide composite reverse osmosis membrane was obtained.
[0048] The test method is the same as that of Comparative Example 1, and its performance is shown in Table 1.
[0049] The electron microsco...
Embodiment 3
[0051] Dissolve 210g of polyvinyl alcohol in 10kg of water, adjust the pH to 3, add 4.4g of sodium periodate, and stir for 2h. Add sodium sulfate until the polymer is precipitated, filter, and dry to obtain a solid powder of bisaldehyde-based polyvinyl alcohol.
[0052] The anti-pollution composite reverse osmosis membrane is made and comprises using the nascent polyamide composite reverse osmosis membrane of the comparative example as the membrane to be grafted, and the membrane surface is contacted with a dialdehyde-based polyvinyl alcohol aqueous solution containing 2% of the mass concentration for 0.5 min. After repeated washing with ion water, a polyamide composite reverse osmosis membrane grafted with hydrophilic polymer and anti-pollution was obtained.
[0053] The test method is the same as that of Comparative Example 1, and its performance is shown in Table 1.
[0054] Figure 4 The electron micrograph of the polyamide composite reverse osmosis membrane prepared for...
PUM
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